endpoint: Ignore delete requests if endpoint is already deleted
endpoint: Ignore delete requests if endpoint is already deleted

There is a small race window in which the endpoint may have been disconnected
already and another deletion would be scheduled and then attempt deletion a
second time, resulting in errors.

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,scanf/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,scanf/cilium,cilium/cilium,tgraf/cilium,scanf/cilium,michi-covalent/cilium,tklauser/cilium,scanf/cilium,tklauser/cilium,tgraf/cilium,scanf/cilium,cilium-team/cilium,scanf/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,scanf/cilium,tgraf/cilium,cilium/cilium,cilium-team/cilium,tgraf/cilium,cilium/cilium